diff --git a/src/db/dbHash.h b/src/db/dbHash.h
index 8d03566da..0f86e4ac3 100644
--- a/src/db/dbHash.h
+++ b/src/db/dbHash.h
@@ -53,7 +53,7 @@ namespace std_ext = std;
 
 namespace DB_HASH_NAMESPACE
 {
-#if !defined(__LP64__)
+#if defined(_WIN64)
   /**
    *  @brief Specialization missing for size_t on WIN32
    */